说明为什么选But,do what we will,__________; we turn repeatedly and

说明为什么选
But,do what we will,__________; we turn repeatedly and with love to the thought of them and to their surviving remnants.We find ourselves attracted to the grizzly bears,too,and know that they and other great,dangerous animals remain alive in our imaginations as they have been all through human time.Though we cut down the nodding thistles,we acknowledge their beauty and are glad to think that there must be some place where they belong.(They may,in fact,not always be out of place in pastures; if,as seems evident,overgrazing makes an ideal seedbed for these plants,then we must understand them as a part of nature's strategy to protect the ground against abuse by animals.) ___________ when we consider how faithfully they perform an indispensable duty in covering the bare ground and in building humus.The weeds,too,are involved in the business of fertility.
选项:
a、we remain under the spell of the primeval forests and prairies that we have cut down and broken …Even the ugliest garden weeds earn affection from us
b、even the ugliest garden weeds earn affection from us …Beavers are famous for making ponds that turn into fertile meadows
c、beavers are famous for making ponds that turn into fertile meadows …We remain under the spell of the primeval forests and prairies that we have cut down and broken
d、a condition that is purely human is not good for people to live in …This conflict often occurs at the expense of both estates

选A
主要的判断依据是第二个选项,"even the ugliest garden weeds earn affection from us" when we consider how faithfully they perform...in covering the bare ground...从意思上看,能 cover bare ground（遮住光秃秃地面）的只有weeds（杂草）了,题中出现的 they perform 中的 they 当然就是指 weeds了,其它选项毫无头绪.再回头选项A的看第一个答案：.do what we will,"we remain under the spell of...",这里有一个让步：尽管我们想干嘛就干嘛,却仍然受到（我们所砍伐和破坏的）原始森林和大草原的魔咒的影响